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LR Grade DH36 Shipbuilding Steel Plate - High-Strength Marine Structural Steel

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LR Grade DH36 shipbuilding steel plate is a high-strength, low-temperature-resistant structural steel for ship hulls certified by Lloyd’s Register (LR). It combines excellent low-temperature toughness at -20°C, stable fatigue resistance, and good weldability and formability, making it suitable for shipbuilding and offshore engineering applications in extremely cold environments and under high-load conditions. We offer a full range of LR DH36 shipbuilding steel plates and provide customized processing services such as precision cutting, bending, drilling, surface rust removal, shot blasting, anti-corrosion coating, and heat treatment.

Certification :
LR Rules
Grade :
LR Grade DH36 (LD DH36)
Thickness :
5.0 - 150.0 mm
Width :
1,500.0 - 4,000.0 mm
Length :
6,000.0 - 18,000.0 mm

Special thickness, width, and length can be negotiated separately.
We also provide customized processing services.If you have any questions, please contact us.

Overview

1. What is LR Grade DH36 shipbuilding steel plate?

LR Grade DH36 shipbuilding steel plate is a high-strength hull structural steel certified by Lloyd’s Register (LR) of the United Kingdom. It features low-temperature impact toughness at -20°C, high structural strength, stable mechanical properties, excellent weldability, and resistance to seawater corrosion.

This steel grade is specifically designed for medium- to high-load vessels and offshore engineering structures. It meets stringent low-temperature toughness and structural safety requirements and can effectively withstand extreme wave impacts, long-term fatigue loads, seawater corrosion, and the risk of low-temperature brittle fracture. It is suitable for critical load-bearing structures in high-capacity ocean-going vessels, polar support vessels, and deep-sea offshore engineering projects.

We are committed to providing high-performance, cost-effective LR Grade DH36 marine steel solutions to the world’s leading shipyards and offshore engineering contractors.

2. Meaning of the Designation

LR: Certified by Lloyd’s Register (LR)

D: Quality grade D (Must meet the requirements of the impact test at -20°C)

H: High strength

36: Minimum yield strength: 355 MPa (≈ 36 kgf/mm²)

Available Specifications and Dimensions

Product Name	LR Grade DH36 Shipbuilding Steel Plate
Certification	LR (Supports dual or multiple certifications from major classification societies such as CCS, ABS, BV, DNV, and NK.)
Grade	LR DH36
Classification	High-Strength Structural Steel for Ship and Ocean Engineering
Thickness	5 - 150 mm
Width	1,500 - 4,000 mm
Length	6,000 - 18,000 mm
Delivery Conditions	Hot Rolled (HR), Thermo-Mechanical Controlled Processed (TMCP), Normalized (N).
Surface Conditions	Original hot-rolled scale, No cracks, scarring, delamination, inclusions, or deep scratches.
Machining Services	Precision cutting, bending, drilling, beveling, surface rust removal, shot blasting, anti-corrosion coating, and customized secondary processing.
Inspection	Charpy V-notch impact test, Ultrasonic testing (UT), Z-direction property test (Grades Z15/Z25/Z35), Third-party test (such as SGS, BV), etc.
Applications	It is primarily used for the hulls, decks, side plating, cargo hold structures of ocean-going vessels, and load-bearing components of offshore platforms in cold-water regions.
MOQ	5 tons (small orders can be negotiated).
Delivery Time	15 - 20 days after order confirmation (urgent orders accepted)
Packaging	Standard export packaging for sea transport, or as required.
Country of origin	China

Chemical Composition

(Heat Analysis, wt %)

Grade	C	Si	Mn	P	S	Cu	Cr	Ni	Nb	V	Ti	Mo	Als
LR DH36	≤ 0.18	≤ 0.50	0.90 - 1.60	≤ 0.025	≤ 0.025	≤ 0.35	≤ 0.20	≤ 0.40	0.02 - 0.05	0.05 - 0.10	≤ 0.02	≤ 0.08	≥ 0.015

Carbon Equivalent

Thickness (mm)	5 - 50	50 - 150
Typical CEV (wt %)	≤ 0.38	≤ 0.40

* Calculation formula (IIW): CEV = C + Mn/6 + (Cr + Mo + V)/5 + (Ni + Cu)/15

Mechanical Properties

Grade	Yield Strength (ReH), MPa	Tensile Strength (Rm), MPa	Elongation (A), %
LR DH36	≥ 355	490 - 630	≥ 21

Impact Properties

Grade	Thickness, mm	Temperature, ℃	Impact Energy, KV₂ / J
Grade	Thickness, mm	Temperature, ℃	Longitudinal	Transverse
LR DH36	≤ 50	- 20	≥ 34	≥ 24
	> 50 - 70	- 20	≥ 41	≥ 27
	> 70 - 150	- 20	≥ 50	≥ 34

Applications

1. Main Structures of Ocean-Going Vessels

1.1 Applicable Vessel Types

Container ships, bulk carriers, crude oil/product tankers, general cargo ships, roll-on/roll-off (RO-RO) ships, refrigerated ships, Northern Sea Route vessels, offshore supply vessels, medium-sized auxiliary icebreakers, and the upper load-bearing structures of cruise ships.

1.2 Typical Application Areas

Load-bearing outer plating: side plating, bottom plating, stem plating, and ice-belt reinforcement plates for ships operating in ice-prone waters.

Deck systems: high-strength main deck, hatch coamings, hatch covers, container lashing bridges, and crane bases.

Compartment Load-Bearing Structures: Double bottoms, longitudinal frames, transverse frames, strong transverse beams, watertight/oiltight transverse bulkheads, top-side compartments, bottom-side compartments, and cargo hold longitudinal bulkheads.

Superstructure and Support Components: Engine room bulkheads, funnel supports, large columns, bulwarks, crane bases, and bow and stern load-bearing frames.

2. Offshore Engineering

Offshore Oil Drilling Platforms: Main structures, support legs, and joint connectors

Offshore Wind Turbine Foundations: Jack-up structures and pile foundation connection sections

FPSOs (Floating Production, Storage, and Offloading Units): Module support structures and hull reinforcement areas

3. Specialized Offshore Floating Structures and Port Equipment

Floating Facilities: Barge, floating dock, floating dry dock, floating crane caissons, temporary offshore work platforms

Heavy-duty Port Equipment: Gantry crane bases, main girders of ship-to-shore cranes, load-bearing piers for large shipways, and steel structures for ship repair docks

4. Ship Repair and Refitting

Suitable for projects such as plate replacement repairs on aging vessels, localized hull reinforcement, ship conversion, and dry dock maintenance.

Key Advantages

1. Official LR Certification

All products hold valid LR certification and factory test reports (MTC), meeting the requirements for acceptance by global shipyards, international offshore engineering tenders, and cross-border customs clearance.

2. Low-Temperature Toughness at -20°C

Demonstrates stable impact toughness at -20°C, ensuring structural safety and consistent mechanical performance during long-term service in cold waters.

3. Excellent Weldability and Machinability

Designed with a low carbon equivalent and good ductility, the material is easy to machine on-site and weld to a high standard, eliminating the need for complex post-weld heat treatment and effectively improving construction efficiency.

4. High Load-Bearing Capacity

Capable of withstanding wave impacts, seawater pressure, and high-load alternating stresses, making it suitable for harsh offshore operating conditions.

5. Resistance to Seawater and Salt Spray Corrosion

Resistant to long-term electrochemical corrosion and salt spray corrosion, reducing maintenance costs and extending the service life of structures.

6. Cost-Effectiveness

Achieves an optimal balance between strength, low-temperature performance, and overall cost, combining adaptability to extreme environments with economic efficiency.

7. Stable Bulk Supply

Adequate stock on hand supports customized bulk production and global exports, ensuring rapid delivery and stable supply for large-scale projects.

FAQ

Q1:

Does LR DH36 shipbuilding steel plate require special welding procedures when used in low-temperature environments?

No. LR DH36 shipbuilding steel plates are designed with an optimized composition featuring low carbon and low impurities, providing excellent low-temperature weldability and compatibility with all conventional, high-standard shipbuilding welding processes. At temperatures as low as -20°C, stable and reliable joint quality can be achieved by following standard welding procedures. No complex preheating or special crack-prevention measures are required, effectively reducing the difficulty of construction in cold regions and improving project efficiency.

Q2:

Do you provide official LR certification for your LR Grade DH36 marine steel plates?

Yes. All of our LR Grade DH36 marine steel plates hold valid official certification from Lloyd’s Register and are accompanied by authoritative EN 10204 3.2 mill test certificates (MTC).

All certificates are globally recognized and support international shipyard tenders, acceptance inspections for offshore projects in extremely cold regions, and cross-border customs clearance.

Q3:

Is LR DH36 steel plate suitable for the core structure of offshore platforms?

Yes. LR DH36 marine structural steel plate is the premier material of choice for primary and secondary load-bearing structures on offshore platforms.

Its ultra-high strength, excellent low-temperature toughness, and resistance to seawater corrosion make it fully suited to harsh marine operating environments and meet the high standards for safety and durability in offshore engineering.

Q4:

What is the difference between LR DH32 and LR DH36 marine steels?

LR DH32 has a minimum yield strength of 315 MPa and is suitable for offshore projects with moderate loads; it offers better weldability and lower costs. LR DH36 has a minimum yield strength of 355 MPa and is suitable for heavy-duty deep-sea projects. LR DH32 is more cost-effective for traditional offshore structures in temperate waters with moderate load requirements.